Java：值类型为ArrayList时的地图列表

Question

I'm working on a java project and i want to create a list of Maps that the type of keys is Character and the values are ArrayLists of Characters. I have written something like this :

List<Map<Character, ArrayList<Character>>>

but the eclipse says : Syntax error on token ">>>", VariableDeclarator expected after this token

How can i do it ? any idea ?

Answer 1

The compiler is expecting a variable name to comply with Java syntax:

List<Map<Character, List<Character>>> myList = 
                              new ArrayList<Map<Character, List<Character>>>();

Answer 2

List<Map<Character, ArrayList<Character>>> list ; should be given

see the screen shot below

Answer 3

您可以将变量声明为接口（例如List ），但是要创建实例，必须选择一个实现（例如ArrayList ）：

List<Map<Character, ArrayList<Character>>> myList = new ArrayList<Map<Character, ArrayList<Character>>>();